JPH1043000A - Rotary mechanism for seat of chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact rotary mechanism made lightweight and small- sized and capable of reducing the assembling time and labor. SOLUTION: This rotary mechanism for the seat 2 of a chair is provided with a spring 10 on a shaft 3 fixed to the leg of the chair, one end of the spring 10 is locked on the shaft 3, and the other end is engaged interlockably with the rotation of the seat 2 of the chair. A abutted section 8c formed on a stopper receiver 8 is arranged into abutted with a projection formed on a stopper 6. A first bush 5, the stopper 6, and a second bush 7 are stored in the stopper receiver 8, and the first bush 5, the stopper 6, and the second bush 7 are fitted into the shaft 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotating mechanism of a chair seat.

[0002]

2. Description of the Related Art As a conventional mechanism for rotating a seat of a chair, there is, for example, a mechanism described in Japanese Utility Model Publication No. 64-128, in which a stopper and a stopper receiver for restricting the range of tilting of the seat are incorporated in the seat. There was an advantage in terms of durability.

[0003]

However, the above-described conventional pivot mechanism for a chair seat has a structure in which a load is received on one side of a stopper receiver having a mountain-shaped cross section. There is a problem that the dimensions are slightly large and the stopper receiver is likely to be distorted. Further, the number of parts is large and assembling a large number of chairs requires much labor. The present invention provides a compact chair in which the size from the shaft center to the surface receiving the load of the stopper receiver is reduced to reduce the weight and size, the distortion of the stopper receiver can be reduced, and the assembling labor can be reduced as much as possible. It is an object of the present invention to obtain a rotation mechanism of the seat.

[0004]

According to the first aspect of the present invention, a spring (10) is provided on a shaft (3) fixed to a leg (1) of a chair.
0) is locked at one end to the shaft (3) and the other end is seated at the chair (2).
A contact portion (8c) formed on a stopper receiver (8) in a rotation mechanism of a chair seat engaged so as to be interlocked with the rotation of
The first bush (5), the stopper (6), and the second bush (7) are built in the stopper receiver (8) by arranging the first bush (5) so as to be able to abut on the protrusion (6d) formed on the stopper (6). The first bush (5), the stopper (6), and the second bush (7) are fitted to the shaft (3) to solve the problem. According to the second aspect of the present invention, the cross section of the shaft (3) is formed in a polygonal shape, and the first bush (5), the stopper (6), and the second bush (7) are respectively provided with the cross section of the shaft (3). Holes of the same shape (5
2. The rotation of the chair seat according to claim 1, wherein the first bush (5), the stopper (6) and the second bush (7) are integrally formed as a unit. A mechanism is preferred. According to the third aspect of the present invention, the stopper (6) is provided with a recess (6c), and the first bush (5) and the second bush (7) are respectively fitted with the projections (5c, 7c) fitted into the recess (6c). ) Is preferably a pivot mechanism for a chair seat according to claim 1. According to the fourth aspect of the present invention, the second bush (7) is made of an elastic material, and the anti-shake collar (7d) that can be engaged with the stopper receiver (8) is formed. It is preferable to use a rotating mechanism for a chair seat. In the invention of claim 5,
The chair pivot mechanism according to any one of claims 1 to 4, wherein the projecting portion (6d) and the contact portion (8c) are arranged in a pair at symmetric positions with respect to the axis (3). preferable.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In the following, the front and rear sides of the seat when the chair is seated will be referred to as the front side and the rear side, respectively. In FIGS. 1 and 6, legs 1 formed by, for example, die-casting are provided on both sides of a position where a chair of each unit of a connected chair such as a conference hall or a hall is installed.
1 is a bolt (not shown) attached to the mounting pieces 1a, 1a at the rear lower end.
The shaft stoppers 1b and 1b projecting from the respective inner surfaces of the legs 1 and 1 are provided in the notches 2a and 2a of the seat 2 by blow molding or the like. The shaft 3 is fixedly attached to each end of each unit with a separate member interposed therebetween, and the seat 2 is rotatable between a standing position and a seating position using the fixed shaft 3 as a support.

Embodiments of the present invention The components of the pivot mechanism of the chair seat will be sequentially described. Arms 4 and 4 made of, for example, die-casting and having a shape that covers the outer periphery of the rear portions on both sides of the seat 2 penetrating the shaft 3 are fixed by screwing screws (not shown) into the mounting holes 4b and 4b. I have. In the following description, for simplicity, the description will be made only on one side of the arms 4. The arm 4 is formed by a plate surface having a thickness selected so as to be substantially flush with the outer periphery of the rear portion on both sides of the seat 2, and has cylindrical bush holes 4a, 4a
Are provided facing each other. The stopper receiver 8 includes the shaft 3
A circular bush hole 8b is formed in the center at right angles to the side plate 8a, and the side plate 8a is formed by an arc portion facing the periphery, and the contact portions 8c, 8c which are parallel to the shaft 3 and are symmetrically positioned.
c and 8c have one ends fixed to opposed arc portions of the side plate 8a and extend in the axial direction of the shaft 3, and the other ends are fixed to the arms 4 at front and rear opposing positions of the bush hole 4a. On only one side plate 8a (the left side in FIGS. 1 and 2), a rod-shaped oscillating piece 9 is formed inside the receiving plate 8c and has a rectangular cross section and is parallel to the axis of the shaft 3.

The stopper 6 is made of a metal plate and has a rectangular hole 6b formed at the center thereof, which can be fitted to the shaft 3. The stopper 6 has projections 6d, 6d and arcs 6a, 6a at symmetrical positions around the hole. , Are provided with arc-shaped concave portions 6c, 6c penetrating at positions facing the side outer edge. The first bush 5 is made of an elastic material, such as synthetic resin, and has a rectangular hole 5b at the center thereof, which can be fitted to the shaft 3, and a half-section that can be fitted to the recesses 6c, 6c at the opposed position on the inner side surface. Circular protrusions 5c, 5c and a cylindrical portion 5a having an outer diameter slidable in the bush hole 4a are provided on the outer side surface. The second bush 7 is made of, for example, a synthetic resin having elasticity, and has a square hole 7b formed at the center thereof, which can be fitted to the shaft 3, and a cylindrical anti-shake with a larger diameter than the bush hole 8b at an inner end edge. A flange 6d, a cylindrical portion 7a having an outer diameter slidable in the bush hole 8b on the outside, and projections 5c, 5c at opposite positions of the outer side outer edge of the cylindrical portion 7a.
c, and projections 7c, 7c having a semicircular cross section that can be fitted to the projections c. The inner side surface is preferably a curved portion having a curved surface. If it is flat, it is necessary to prepare a separate washer having a curved surface, and the number of parts will increase.
The spring guide bush 12 is made of, for example, a synthetic resin, and has a square hole 12b formed at the center thereof so as to be fitted to the shaft 3.
A cylindrical portion 12a on the outer periphery of which a spring 10 can be fitted.
And a cylindrical flange 12c at the outer edge.

The spring 10 has two end portions 10a, 10
b and the main body 10c, and the two terminal portions 10a and 10b can be fitted on the cylindrical portion 12a out of phase. The fixed plate 11 includes a base 11b fixed along the surface of the shaft 3 in the axial direction and a rod-shaped rocking piece 9 having a rectangular cross-section and being continuously provided from the base 11b while maintaining a lower surface height m from the surface of the shaft 3.
And a front end portion 11a having substantially the same width as the front end portion 11a.
It is disposed at a neutral position between them. Fixing plate 11,
The first bush 5, the stopper 6, the second bush 7, and the spring guide bush 12 are fixed to the shaft 3 irrespective of the rotation of the chair seat 2. The shaft 3 may be not a square cross section but another polygon, but in this case, each hole 5b, 6b, 7
Also, b and 12b need to be adjusted to this polygon, and a square is most preferable from the viewpoint of processing. On the other hand, the stopper receiver 8 and the swinging piece 9 are rotatable in response to the rotation of the arm 4 due to the rotation of the seat 2 of the chair. Normally, each of the spring 10, the fixing plate 11, and the spring guide bush 12 is provided only on one of the rod-shaped rocking pieces 9 (the left side in FIGS. 1 and 2), and the first bush 5, the stopper 6, the second bush 7,
The stopper receivers 8 are provided on both sides, respectively.
The first bush 5, the stopper 6, the second bush 7, and the stopper receiver 8 on the right side are arranged symmetrically to the left side.

The assembled state of the rotating mechanism of the chair seat will be described with reference to FIGS. From the left side, the protrusions 5c and 5c are provided on the cylindrical portion 5a of the first bush 5 and the concave portion 6 of the stopper 6 is provided.
c, 6c, and a projecting wall 4b formed in the bush hole 4a
The first bush 5 is fitted to the stopper 6 and the stopper 6 is arranged such that the protrusions 6d, 6d of the stopper 6 protrude outward from the gap formed by the contact portions 8c, 8c of the stopper receiver 8 and the side plate 8a. Then, the cylindrical portion 7a of the second bush 7 is fitted into the bush hole 8b of the stopper receiver 8 from the inside,
The protrusions 7 of the second bush 7 are provided in the remaining gaps of the recesses 6c, 6c.
c and 7c are fitted. As described above, the protrusions 5c, 5c
And 7c, 7c, together with the recesses 6c, 6c, have a semicircular cross section that can be fitted into the recesses 6c, 6c, so that the first bush 5, the stopper 6, and the second bush 7 can be easily set.

The main body 10c of the spring 10 is fitted on the cylindrical portion 12a of the spring guide bush 12, and the hole 1
The shaft 3 is inserted into the end 2a of the fixed plate 11 in the axial insertion direction z up to the inner end of the end 11a, and the outer end of the shaft 3 is formed into a first bush 5, a stopper 6, and a second bush 7, each having a square shape. 5b, 6b, and 7b are inserted and set in the shaft insertion direction Z. At this time, both ends 10a, 10b of the spring 10
The rod-shaped swinging piece 9 is adjusted so as to be interposed below the tip 11a. The swinging piece 9 is held while maintaining the upper surface height n lower than the height m of the lower surface of the tip portion 11a from the surface of the shaft 3, the shaft 3, the first bush 5, the stopper 6, the second bush 7, and the spring guide bush. 12 is a chair seat 2
The stopper receiver 8 and the swinging piece 9 can be moved in conjunction with the rotation of the chair seat 2. As described above, since the holes 5b, 6b, 7b, and 12b have the same shape to which the square shaft 3 can be fitted, each of these holes and the shaft 3 can be easily set.

Next, the operation of the above-described chair seat rotating mechanism will be sequentially described. FIG. 5A shows the case of the sitting position, in which case the protrusion 6 of the metal stopper 6 is used.
The contact portions 8c, 8c of the stopper receiver 8 with d, 6d are adjusted to positions where they do not contact.

FIG. 5B shows the case of the seating position.
When the seat 2 rotates in the seat rotation direction x from the sitting position,
A stopper receiver 8 linked to the rotation of the seat 2 comes into contact with the protruding portions 6d, 6d fixed to the shaft 3 and stops, and up to this position, the rocking piece 9 moves in the seat rotation direction. The distal end 11a of the fixed plate 11 abutting on one end 10a of the spring 10 abuts on the other end 10b of the coil spring 10 and is fixed to the shaft 3 so that the resilience of the spring 10 and the occupant's The chair can be smoothly and easily seated in a stable and balanced state. When the occupant stands up, the seat 2 can be automatically erected and restored in the seat pivoting direction Y from the sitting position to the sitting position by the elastic force of the spring 10.

The protruding portion 6d and the contact portion 8c are connected to the shaft 3
May be provided one by one instead of the symmetric position, but it is preferable to dispose one pair at the symmetric position. In the case where the stopper receiver 8 and the stopper 6 are abutted at two places, the dimension from the shaft center to the surface receiving the load of the stopper receiver 8 can be made smaller and the weight can be reduced. It can be attached to a thin seat that could not incorporate the stopper receiver and stopper. Further, since the load applied to the stopper receiver 8 can be distributed to the two places of the first bush 5 and the second bush 7, distortion of the stopper receiver 8 can be reduced, and the weight of parts can be reduced.

[0014]

According to the rotation mechanism of the chair seat of the present invention,
Since the load applied to the stopper receiver can be distributed to the two locations of the first bush and the second bush, distortion of the stopper receiver can be reduced, and the weight of the component can be reduced. In addition, the size from the shaft center to the surface receiving the load of the stopper receiver is reduced to make it lighter and smaller, and can be attached to a thin seat in which the stopper receiver and the stopper could not be built in conventionally.
Furthermore, since it is a compact mechanism, the labor for assembling can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a rotating mechanism of a chair seat of the present invention.

FIG. 2 is an exploded perspective view of the components of the rotation mechanism of the chair seat of FIG. 1;

FIG. 3 is an exploded perspective view of a first bush, a stopper, and a second bush of the rotation mechanism of the chair seat of FIG. 1;

FIG. 4 is a schematic sectional view of a main part of the chair turning mechanism of FIG.

FIG. 5 is a partial schematic side view of (a) a seat upright position, and (b) a seating position, showing a relationship between a stopper and a stopper receiving member of the rotating mechanism of the chair seat of FIG. 1;

FIG. 6 is a partially exploded perspective view showing another part of the chair provided with the rotation mechanism of the chair seat of FIG. 1;

[Explanation of symbols]

 1 leg 1a mounting piece 1b shaft stopper 2 seat 2a notch 3 shaft 4 arm 4a, 8b bush hole 4b projecting wall 5 first bush 5a, 12a cylindrical portion 5b, 6b, 7b, 12b hole 5c, 7c protrusion 6 stopper 6a Arc part 6c Concave part 6d Projection part 7 Second bush 7a Cylindrical part 7d Anti-shake collar 8 Stopper receiver 8a Side plate 8c Contact part 9 Swinging piece 10 Spring 10a, 10b Terminal part 10c Main body 11 Fixed plate 11a Tip 11b Base 12 Spring guide bush 12c Collar part X, Y Seat rotation direction m, n Height

Claims (5)

[Claims] 1. A spring (10) is provided on a shaft (3) fixed to a leg (1) of a chair, and one end of the spring (10) is locked on the shaft (3), and the other end is seated on a chair (2). ), The contact portion (8c) formed on the stopper receiver (8) is brought into contact with the protrusion (6d) formed on the stopper (6). The first bush (5), the stopper (6) and the second bush (7) are built in the stopper receiver (8), and the first bush (5) and the stopper are mounted on the shaft (3). (6) and the second
A rotating mechanism for a chair seat, wherein a bush (7) is fitted. 2. A cross section of the axis (3) is formed in a polygonal shape,
The bush (5), the stopper (6) and the second bush (7) each have a hole (5) having the same shape as the cross section of the shaft (3).
The chair according to claim 1, wherein the first bush (5), the stopper (6) and the second bush (7) are integrally unitized by forming the first bush (5), (6b) and (7b). Rotation mechanism of the seat. 3. The stopper (6) is provided with a recess (6c), and the first bush (5) and the second bush (7) are formed with protrusions (5c, 7c) respectively fitted into the recess (6c). The rotating mechanism for a chair seat according to claim 1, wherein: 4. The device according to claim 1, wherein the second bush is made of a resilient material, and is formed with an anti-shear collar which can be engaged with the stopper receiver. Rotation mechanism of chair seat. 5. The chair according to claim 1, wherein the projection (6d) and the abutment (8c) are arranged in pairs symmetrically with respect to the axis (3). Rotation mechanism of the seat.